v1.9 Changelog (#1717)

* Update CHANGELOG.md

* Update CHANGELOG.md

* Update CHANGELOG.md

* Update CHANGELOG.md

* Update CHANGELOG.md

* Update CHANGELOG.md

* Update CHANGELOG.md

CHANGELOG.md

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 # Mattermost Mobile Apps Changelog
 
+## v1.9.0 Release
+- Release Date: June 16, 2018
+- Server Versions Supported: Server v4.0+ is required, Self-Signed SSL Certificates are not supported
+
+### Highlights
+
+#### Improved first load time on Android
+ - Significantly decreased first load time on Android devices from cold start.
+ 
+#### iOS Files app support
+- Added support for attaching files from the iOS Files app from within Mattermost.
+
+#### Improved styling of push notification
+- Improved the layout of message content, channel name and sender name in push notifications.
+
+### Improvements
+
+ - Combined join/leave system messages.
+ - Added splash screen and channel loader improvements.
+ - Removed the desktop notification duration setting.
+ - Added cache team icon and set background to always be white if using a PNG file.
+ - Added whitelabel for icons and splash screen.
+
+### Bug Fixes
+
+ - Fixed an issue where other user's display name did not render in combined system messages after joining the channel.
+ - Fixed an issue where posts incorrectly had "Commented on Someone's message" above them.
+ - Fixed an issue where deleting a post or its parent in permalink view left permalink view blank.
+ - Fixed an issue where "User is typing" message cut was off.
+ - Fixed an issue where `More New Messages Above` appeared at the top of new channel on joining.
+ - Fixed an issue where a user was not directed to Town Square when leaving a channel.
+ - Fixed an issue where long post were not collapsed on Android.
+ - Fixed an issue where a user's name was initially shown as "someone" when opening a direct message with the user.
+ - Fixed an issue where an error was received when trying to change the team or channel from the share extension.
+ - Fixed an issue where switching to a newly created channel from a push notification redirected a user to Town Square.
+ - Fixed an issue where a public channel made private did not disappear automatically from clients not part of the channel.
+
 ## v1.8.0 Release
 - Release Date: April 27, 2018
 - Server Versions Supported: Server v4.0+ is required, Self-Signed SSL Certificates are not supported